tl 084 scheme questions

duni · 26th March 2004, 02:16 PM

I've build a 1 in 4 distribution amp with TL084 , but my scheme seems to be wrong , because I have problems when I turn it on. here is the scheme :

but I have strange problems , actially only one:
just one op.amp TL084 repeats the audio signal just fine. but when I put another for the another channel I become a mono effect(the balance control doesn't work) and strenge mixing and losing some high or low frequences.
Actually I just need to split the signal from my soundcard into 5.
Can someone help me!

Thank You!

dhaen · 26th March 2004, 02:57 PM

I must say, this is much more complex than it need be... But let's concentrate on making it work in present form:

Where does the braid (outer) of the input cable connect to?

duni · 26th March 2004, 03:05 PM

sooo... You are right. it's too complicated.
I found this one here:

Would it work fine with 470R or 1K is better for pc soundcard.

PS:forget the other scheme, as I suspected it's toooooo complicated and there is no sence to make it like that

dhaen · 26th March 2004, 04:47 PM

Remember that the input and output cable shields should connect to 0v.
A bipolar power supply (+ & -) is necessary, but the supply ripple will be largely cancelled out by the opamps when run this way.

duni · 27th March 2004, 05:00 AM

Do I need some condensators (C) in this scheme?

duni · 27th March 2004, 08:06 AM

Are You sure that I have to connect the audio 0 to the power supply 0?

duni · 27th March 2004, 01:46 PM

I've made it

. In my scheme the 470 ohms resistors are replaced by 220 ohms, it's all fine and the audio 0 is conected with the supply 0 by 1K resistor.

26th March 2004, 02:16 PM	#1
duni diyAudio Member Join Date: Mar 2004 Location: varna	tl 084 scheme questions I've build a 1 in 4 distribution amp with TL084 , but my scheme seems to be wrong , because I have problems when I turn it on. here is the scheme : but I have strange problems , actially only one: just one op.amp TL084 repeats the audio signal just fine. but when I put another for the another channel I become a mono effect(the balance control doesn't work) and strenge mixing and losing some high or low frequences. Actually I just need to split the signal from my soundcard into 5. Can someone help me! Thank You!

26th March 2004, 04:47 PM	#4
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	That's better! Remember that the input and output cable shields should connect to 0v. A bipolar power supply (+ & -) is necessary, but the supply ripple will be largely cancelled out by the opamps when run this way.

27th March 2004, 01:46 PM	#7
duni diyAudio Member Join Date: Mar 2004 Location: varna	I've made it. In my scheme the 470 ohms resistors are replaced by 220 ohms, it's all fine and the audio 0 is conected with the supply 0 by 1K resistor.

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26th March 2004, 02:57 PM	#2
dhaen diyAudio Moderator Emeritus Join Date: Jun 2002 Location: U.K.	I must say, this is much more complex than it need be... But let's concentrate on making it work in present form: Where does the braid (outer) of the input cable connect to?

26th March 2004, 03:05 PM	#3
duni diyAudio Member Join Date: Mar 2004 Location: varna	sooo... You are right. it's too complicated. I found this one here: Would it work fine with 470R or 1K is better for pc soundcard. PS:forget the other scheme, as I suspected it's toooooo complicated and there is no sence to make it like that

27th March 2004, 05:00 AM	#5
duni diyAudio Member Join Date: Mar 2004 Location: varna	Do I need some condensators (C) in this scheme?

27th March 2004, 08:06 AM	#6
duni diyAudio Member Join Date: Mar 2004 Location: varna	Are You sure that I have to connect the audio 0 to the power supply 0?

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